--- src/engine/mathml/mathVariantAux.cc.orig	2019-02-22 10:59:22 UTC
+++ src/engine/mathml/mathVariantAux.cc
@@ -19,6 +19,7 @@
 #include <config.h>
 
 #include <cassert>
+#include <cstring>
 
 #include "mathVariantAux.hh"
 
